If your pool has turned completely green as a result of algae growing in it, you may need to take these steps to restore it to its previous clean and algae-free state.
Call a contractor who offers swimming pool cleaning services
If a swimming pool only has a tiny bit of algae growing in it, its owner could potentially remove it simply by increasing the amount of chlorine in the water. However, if your pool water has been completely taken over by this organism, then you should probably to reach out to a pool contractor who provides swimming pool cleaning services and ask them to drain and deep-clean this structure.
At this stage, the algae will not only be in the pool water itself but will also have coated the actual interior pool surface. The quickest way to get this coating off the pool interior is to use a combination of a scrubbing brush and a pressurised water hose, which will mechanically remove the algae.
However, the pool needs to be drained before you can do this, and commercial versions of the aforementioned equipment will be bigger and more powerful than the ones you might have in your home. Because they have access to these commercial cleaning tools know how to rapidly drain a pool, your pool contractor should be able to get rid of the algae a lot more quickly than you could.
Additionally, this is an extraordinarily messy and unpleasant job, due to the fact that the pool, after being emptied, will be very wet, slimy and musty-smelling. The chances of you slipping and landing in a slimy, algae-riddled puddle will be high, as will the likelihood of the algae splattering onto your face, hair and clothes as you scrub it off. As such, if you're even slightly squeamish, it is best to let a professional pool contractor do the cleaning.
Find out what caused the algae to grow in the first place
If you want to minimise the frequency with which you need your pool deep-cleaned by contractors in this manner, you must determine what caused the algae to proliferate in the first place. Given that, as mentioned above, chlorine can kill algae spores, it is possible that this issue arose as a result of you not keeping the chlorine levels in your pool high enough. If this is the case, then you may need to invest in a pool test kit and start testing the water's chlorine levels more often and then adjusting them if they fall too low.
If you do not believe that the lack of chlorine in your pool was the culprit in this situation, then you may have to consider other possibilities. For example, if you regularly spray fertiliser on the flowerbeds around your swimming pool, it is possible that some of this airborne fertiliser may have ended up landing in your pool. Because this fertiliser can also help algae to grow, it may have led to this organism proliferating. If this is indeed what happened, then you might have to start covering your pool before you fertilise your flowerbeds.